400 Bad Request

[erashdan]

Hello
I'm facing issue with queue every two days with response 400 from amazon

Error executing "UploadDocuments" on "http://SEARCHURL/2013-01-01/documents/batch?format=sdk"; AWS HTTP error: Client error: POST http://SEARCH-URL.com/2013-01-01/documents/batch?format=sdk resulted in a 400 Bad Request response:
{"status": "error", "errors": [{"message": "[Deprecated: Use the outer message field] Validation error for field 'body (truncated...)

I set batching_size to 10 and still face same issue

Please help